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Int 13 Fn 0F - Hard Disk - Write Sector Buffer (xt Only) [B]
AH = 0Fh
DL = drive number (80h = first, 81h = second hard disk)
ES:BX -> buffer
Return: CF set on error
CF clear if successful
AH = status code (see AH=01h)
Notes: does not write data to the drive
should be called before formatting to initialize an XT-type
controller's sector buffer
used for diagnostics only on PS/2 systems
See Also: AH=0Bh
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